Medical microvascular anastomat fixed by microneedle

Abstract

The invention is suitable for the technical field of blood vessel anastomosis, and provides a microneedle fixing medical microvessel anastomat which is used for anastomosis of a blood vessel A and a blood vessel B. The microneedle fixing medical microvessel anastomat comprises an anastomosis ring, the inner wall of one end of the anastomosis ring is arranged to be a guide inclined face, a fixing microneedle is arranged on the outer wall of the anastomosis ring, and a guide microneedle is arranged on the guide inclined face. The traction end of the blood vessel A penetrates through the anastomosis ring and is turned outwards to be arranged outside the anastomosis ring in a sleeving mode, the traction end of the blood vessel B is arranged outside the blood vessel A in a sleeving mode, the fixing micro needle penetrates into the blood vessel A and the blood vessel B, and the guiding micro needle penetrates into the blood vessel A. The device solves the problems that the anastomosis difficulty is increased and the blood supply patency rate of the blood vessel after anastomosis cannot meet the requirement due to retraction and collapse generated in the microvessel anastomosis process, and achieves the effects of avoiding retraction and collapse of the microvessel after anastomosis due to the elasticity of the microvessel and improving the blood supply patency rate.

Description

Technical Field

[0001] This invention relates to the field of vascular anastomosis technology, and more specifically, to a microneedle-fixed medical microvascular anastomosis device. Background Technology

[0002] Vascular anastomosis is one of the core techniques in microsurgery, and its success directly determines the success or failure of free tissue transplantation, organ replantation, and complex tissue repair. With the continuous development of clinical techniques, the mainstream method of vascular anastomosis has gradually evolved from the "manual suture method." Among these, mechanical microvascular anastomosis devices are mainly represented by the Coupler system produced by Synovis in the United States. This system uses a stainless steel needle and a high-molecular-weight polyethylene ring structure to complete the eversion puncture, fixation, and docking of blood vessels. Although it shows high efficiency and patency rates in anastomosing medium-diameter vessels (1.0–3 mm), it still has significant limitations in anastomosing microvessels (0.5 mm–1 mm). Both the Coupler system and similar anastomosers require two people to operate; it is difficult for a single person to complete the anastomosis. For microvascular anastomosis, there are also various drawbacks, such as uneven stress distribution on the vessel wall due to the high rigidity of the ring and limited eversion angle.

[0003] Patent CN107088080B discloses a vascular anastomosis device and its anastomosis operation method, including a guide sleeve assembly and a jaw assembly connected to the guide sleeve assembly. The jaw assembly contains a discharge ring and an outer ring support tube connected to the discharge ring. An elastic vascular anastomosis outer ring is sleeved on the outer ring support tube, and an inner vascular anastomosis ring that mates with the outer ring is fitted inside the outer ring. The guide sleeve assembly and jaw assembly can position and guide the anastomosis ring, allowing the outer ring to detach smoothly and precisely mate with the inner ring to achieve vascular anastomosis.

[0004] The aforementioned anastomosis device employs a method of eversion of the blood vessels, allowing the intima of one vessel to adhere to the intima of another for anastomosis and fixation. While this avoids the drawback of traditional anastomotic devices, which cannot be operated by a single person, the use of a puncture structure to directly puncture and fix the two vessels after intimal docking can cause local intimal damage and platelet aggregation, thereby increasing the risk of thrombosis, vascular occlusion, and transplant tissue necrosis. Furthermore, the blood vessels inevitably elongate during stretching and eversion, and after anastomosis, they may recoil due to their own elasticity, leading to narrowing of the vessel diameter and collapse, thus affecting the normal blood supply to the anastomosed vessel. In actual anastomosis, medium-diameter vessels (1–3 mm) have relatively thick walls, which can resist and reduce recoil and collapse to some extent. However, microvessels (0.5 mm–1 mm) have thinner walls, making recoil and collapse highly probable during anastomosis, increasing the difficulty of anastomosis, inconvenience in operation, and the inability to achieve the required blood supply patency after anastomosis.

[0005] Therefore, it is necessary to propose a microneedle fixation medical microvascular anastomosis device to avoid the microvessels from shrinking and collapsing due to their own elasticity after anastomosis, thereby reducing the difficulty of operation and improving the blood supply patency of the blood vessels after anastomosis. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a microvascular anastomosis device that uses tilting guidance to cause slight eversion of blood vessels, and uses microneedles to fix different blood vessels separately, thereby preventing blood vessels from shrinking or collapsing due to their own elasticity.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A microneedle-fixed medical microvascular anastomosis device is used to anastomose blood vessels A and B. It includes an anastomosis ring, with one end of the anastomosis ring having an inner wall configured as a guide bevel. A fixing microneedle is disposed on the outer wall of the anastomosis ring, and a guide microneedle is disposed on the guide bevel. The traction end of blood vessel A passes through the anastomosis ring and is folded outwards and fitted over the outside of the anastomosis ring. The traction end of blood vessel B is fitted over the outside of blood vessel A. The fixing microneedle is inserted into both blood vessels A and B, and the guide microneedle is inserted into blood vessel A.

[0009] The present invention is further configured such that: after the anastomosis of blood vessel A and blood vessel B, the retraction direction is opposite to the traction direction; the setting direction of the fixing microneedle is opposite to the retraction direction of blood vessel A and blood vessel B; and the setting direction of the guiding microneedle is opposite to the retraction direction of blood vessel A.

[0010] The present invention is further configured such that: the fixed microneedle is inserted into the vessel wall of vessel A and vessel B, and the guide microneedle is inserted into the vessel wall of vessel A.

[0011] The present invention is further configured such that: the inner circumferential surface of the guide portion forms a guide slope, the outer circumferential surface forms a fixing surface, and a transition arc surface is provided between the guide slope and the fixing surface.

[0012] The present invention is further configured such that: the fixing microneedle includes a first microneedle for fixing blood vessel A and a second microneedle for fixing blood vessel B, wherein blood vessel B is fixed by the second microneedle after passing through the first microneedle.

[0013] The present invention is further configured such that: an alignment mark is provided on the outer wall of the anastomosis ring, and the alignment mark is located between the first microneedle and the second microneedle.

[0014] The present invention is further configured such that: a transition arc surface is provided between the guide slope and the outer wall of the matching ring, and the guide slope and the transition arc surface are smoothly connected.

[0015] The present invention is further configured such that: the anastomosis device also includes a locking ring sleeved on the outside of blood vessel B, the locking ring being made of an elastic deformable material, the locking ring locking and fixing blood vessel A and blood vessel B on the anastomosis ring.

[0016] The invention is further configured such that: the locking ring has an opening, and pressing the locking ring can close the opening.

[0017] The present invention is further configured such that: a positioning groove is provided around the anastomosis ring, a propulsion limiting ring is provided around the side of the positioning groove away from the guide slope, a limiting tongue is provided around the inner wall of the locking ring, and the limiting tongue is embedded in the positioning groove after the opening is closed.

[0018] The present invention is further configured such that the tilt angle of the fixed microneedle is set to 30°-60°, and the angle of the guide microneedle is set to 30°-60°.

[0019] The beneficial effects of this invention are:

[0020] The inclined structure of the guide ramp forms a tapered cavity with a gradually increasing diameter. Blood vessel A is located inside this cavity, allowing it to naturally extend outwards and slightly evert, mitigating the narrowing of the vessel diameter caused by traction. A first microneedle and a guide microneedle, oriented in the opposite direction to the insertion of blood vessel A, are placed on the guide ramp and the fixing surface. A second microneedle, oriented in the opposite direction to the insertion of blood vessel B, is placed on the fixing surface. After insertion, blood vessels A and B are fixed respectively, preventing retraction and collapse due to their own elasticity. This reduces the difficulty of the procedure while improving the blood supply patency of the anastomosed vessels. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the microneedle fixation medical microvascular anastomosis device of the present invention.

[0023] Figure 2 for Figure 1 The diagram shows the structure of blood vessel A before it is fitted into the anastomosis device.

[0024] Figure 3 for Figure 1 The diagram shows the structure of blood vessel A after it has been fitted with the anastomosis device.

[0025] Figure 4 for Figure 1 The diagram shows the structure of blood vessel B before it is fitted into the anastomosis device.

[0026] Figure 5 for Figure 1 The diagram shows the structure of blood vessel B after it has been fitted into the anastomosis device.

[0027] Figure 6 for Figure 1 The diagram shows the structure of the blood vessel B after the locking ring fragment is broken.

[0028] Figure 7 for Figure 5 A magnified view of a portion of region A shown.

[0029] Figure 8 for Figure 6 A magnified view of a portion of region B shown.

[0030] Explanation of reference numerals in the attached drawings: 1. Anastomotic ring; 11. Main body; 111. Inner wall of the main body; 112. Outer wall of the main body; 113. Positioning groove; 114. Advancement limiting ring; 12. Guide part; 121. Guide slope; 122. Transition arc surface; 123. Fixing surface; 124. Alignment mark; 13. Insertion cavity; 14. Folding cavity;

[0031] 2. Fixed microneedle; 21. First microneedle; 211. First reference surface; 212. First inclined surface; 213. First insertion part; 22. Second microneedle; 221. Second reference surface; 222. Second inclined surface; 223. Second insertion part;

[0032] 3. Guide microneedle; 31. Third reference plane; 32. Third inclined plane; 33. Third insertion part;

[0033] 4. Locking ring; 41. Opening; 42. Limiting tongue;

[0034] 5. Blood vessel A;

[0035] 6. Blood vessels B. Detailed Implementation

[0036] To make the technical problem to be solved, the technical solution, and the beneficial effects of this invention clearer, the invention will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the invention, and therefore only shows the components relevant to the invention. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0037] Please refer to Figure 1-5 A microneedle fixation medical microvascular anastomosis device is disclosed for anastomosing blood vessels A5 and B6. The device includes an anastomosis ring 1, which is a hollow tubular structure with both ends extending through it. The traction direction during anastomosis of blood vessel A5 is as follows: Figure 3 As shown in direction V1, after the anastomosis of vessel A5, the direction of retraction is opposite to the direction of traction. The direction of retraction after the anastomosis of vessel A5 follows the direction shown in the figure. Figure 3 The direction of traction during the B6 anastomosis is shown in V2. Figure 5 As shown in direction V3, after the anastomosis of vessel B6, the direction of retraction is opposite to the direction of traction. The direction of retraction after the anastomosis of vessel B6 follows the direction shown in the figure. Figure 5 As shown in direction V4. During the anastomosis, the microforceps act on one end of the incision site of vessel A5 as the traction end of vessel A5, and on the other end of the incision site of vessel B6 as the traction end of vessel B6. In use, the traction end of vessel A5 passes through the anastomosis ring 1 and is manually pulled outwards, so that the intima of vessel A5 faces outwards. Because vessel B6 has elasticity and can expand, it can be pulled over the outside of vessel A5, allowing the intima of vessel A5 to directly contact the intima of vessel B6 for anastomosis. In other words, the traction end of vessel A5 passes through the anastomosis ring 1 and is folded outwards to fit over the outside of the anastomosis ring 1, while the traction end of vessel B6 fits over the outside of vessel A5, before the anastomosis of vessels A5 and B6 is performed. When the intima of blood vessel A5 and blood vessel B6 come into contact with each other, the natural anti-thrombotic properties of the intima allow the intima to adhere to each other, effectively preventing platelet aggregation and thrombus formation at the incision anastomosis site. This reduces the risk of transplant tissue necrosis and improves the success rate of the surgery.

[0038] Preferably, the length and inner diameter of the anastomosis ring 1 can be set to different sizes according to the characteristics of different types of blood vessels (such as arteries and veins), making it convenient for doctors to select the most suitable microvascular anastomosis device during surgery based on the inner diameter of the blood vessel to be anastomosed. In some embodiments, the length of the anastomosis ring 1 can be set to 0.5-5 times the width of the inner diameter of the anastomosis ring 1, thereby better adapting to the suturing needs of blood vessels of different sizes. It should be noted that the anastomosis ring 1 can be made of high-density polyethylene material, or other non-toxic, harmless, and biocompatible materials. The anastomosis ring 1 can be manufactured using 3D printing equipment, or it can be manufactured using injection molding, extrusion molding, compression molding, or other methods. This application does not specifically limit the material and molding process of the anastomosis ring 1.

[0039] Please refer to Figure 1-5 and Figure 7 Furthermore, to ensure that the incision of blood vessel A5 can naturally evert under the guidance of the anastomosis ring 1 after passing through the anastomosis ring 1, the incision of blood vessel A5 is guided at the end of the anastomosis ring 1. The anastomosis ring 1 includes an integrally formed body part 11 and a guide part 12, which are smoothly connected. The body part 11 is a hollow tubular structure, with the inner circumferential surface of the body part 11 forming the inner wall 111 and the outer circumferential surface forming the outer wall 112, which are parallel to each other. The guide part 12 is a conical ring structure with a gradually expanding cross-section. The inner circumferential surface of the guide part 12 forms a guide slope 121, and the outer circumferential surface of the guide part 12 forms a fixing surface 123. A transition arc surface 122 is provided between the guide slope 121 and the fixing surface 123, and the transition arc surface 122 is smoothly connected to both the guide slope 121 and the fixing surface 123. The fixed surface 123 is coplanar with the inner wall 111 of the main body. The guide slope 121 is inclined relative to the outer wall 112 of the main body, and the guide slope 121 and the outer wall 112 of the main body are smoothly connected. The transition arc surface 122 is set as a smooth arc structure, and its two ends are smoothly connected to the guide slope 121 and the fixed surface 123, respectively. The inner wall 111 of the main body forms a circular fitting cavity 13 at the end away from the guide portion 12, and the guide slope 121 forms a folded cavity 14 at the end away from the main body portion 11, such as... Figure 7As shown, an inclination angle α is formed between the guide slope 121 and the fixing surface 123, causing the diameter of the folding cavity 14 to gradually increase from the end near the body portion 11 to the end away from the body portion 11, forming a cone-shaped cavity with a gradually increasing diameter. Preferably, the inclination angle α can be set to 10°-30°. In some other embodiments, the inclination angle α can also be set to other angles, which are not specifically limited here. After the incision of blood vessel A5 passes through the insertion cavity 13 and through the body portion 11, it can naturally extend outward in the gradually increasing space at the folding cavity 14, producing a slight eversion, which slows down the reduction in the diameter of the blood vessel caused by traction. After the incision of blood vessel A5 naturally everts, it is guided naturally along the transition arc surface 122, avoiding damage to the blood vessel from the sharp edge of the guide portion 12, so that the incision can be smoothly everted to the fixing surface 123 for anastomosis and fixation.

[0040] Please refer to Figure 1-5 and Figure 7Furthermore, to effectively prevent narrowing or collapse of the inner diameter of blood vessels A5 and B6 during elongation and to prevent retraction due to their own elasticity after anastomosis, an everted fixing microneedle 2 is further provided to fix blood vessels A5 and B6, while a guide microneedle 3 is provided to fix blood vessel A5. The fixing microneedle 2 is inserted into blood vessels A5 and B6, and the guide microneedle 3 is inserted into blood vessel A5. Specifically, the fixing microneedle 2 includes a first microneedle 21 for fixing blood vessel A5 and a second microneedle 22 for fixing blood vessel B6, with the first microneedle 21 and the second microneedle 22 disposed on the fixing surface 123. The first microneedles 21 are equidistantly arranged around the fixing surface 123, and multiple rows of the first microneedles 21 are arranged along the guide slope 121. The spacing between two adjacent first microneedles 21 can be adjusted according to different blood vessel types and wall thicknesses, and the spacing between two rows of first microneedles 21 can be adjusted according to different blood vessel types and wall thicknesses; this application does not specifically limit this. The first microneedle 21 is positioned away from the transition arc surface 122, meaning its orientation is the same as the pulling direction of blood vessel A5 and opposite to its retraction direction. When blood vessel A5 is introduced through the folding cavity 14 under tension, the first microneedle 21 does not apply puncture force to it. However, during the retraction process of blood vessel A5 after anastomosis, the first microneedle 21 inserts into blood vessel A5 to fix it in place. Specifically, the cross-section of the first microneedle 21 forms a first reference surface 211 on the side closer to the transition arc surface 122 and a first inclined surface 212 on the side farther from the transition arc surface 122. A first insertion portion 213 is formed at the junction of the first reference surface 211 and the first inclined surface 212. The inclination angle between the first reference surface 211 and the guide inclined surface 121 is greater than the inclination angle between the first inclined surface 212 and the guide inclined surface 121, causing the first insertion portion 213 to be positioned closer to the transition arc surface 122. The length of the first microneedle 21 and its tilt angle relative to the first inclined surface 212 can be adjusted according to the type and wall thickness of the blood vessel, so that after the blood vessel A5 is anastomosed, the first insertion part 213 can pierce the blood vessel wall of the blood vessel A5. Whether it penetrates the blood vessel wall is not specifically limited in this application. Preferably, the tilt angle of the first reference surface 211 of the first microneedle 21 relative to the fixed surface 123 can be set to 30°-60°, that is, the tilt angle of the first microneedle 21 is set to 30°-60°. In some other embodiments, the tilt angle of the first microneedle 21 relative to the first inclined surface 212 can also be set to other angles, which are not specifically limited in this application.

[0041] Please refer to Figure 1-5 and Figure 7The second microneedles 22 are equidistantly arranged around the fixing surface 123, with multiple rows of second microneedles 22 arranged along the fixing surface 123. The spacing between two adjacent second microneedles 22 can be adjusted according to different blood vessel types and wall thicknesses, and the spacing between two rows of second microneedles 22 can be adjusted according to different blood vessel types and wall thicknesses; this application does not impose specific limitations here. The second microneedles 22 are located on the side away from the transition arc surface 122, and a certain gap is left between the second microneedles 22 and the first microneedles 21 to ensure that the incision at blood vessel B6 and the incision at blood vessel A5 have an appropriate distance to complete the anastomosis. The spacing between the second microneedles 22 and the first microneedles 21 can be adjusted according to different blood vessel types and wall thicknesses; this application does not impose specific limitations here. The second microneedles 22 are oriented towards the side away from the transition arc surface 122, that is, the direction of the second microneedles 22 is the same as the traction direction of blood vessel B6 and opposite to the retraction direction of blood vessel B6. When blood vessel B6 is introduced along the fixed surface 123 under traction and expansion, the second microneedle 22 does not apply puncture force to blood vessel B6. However, during the retraction process of blood vessel B6 after anastomosis, the second microneedle 22 pierces into blood vessel B6 to fix it. Specifically, the second microneedle 22 has a second reference surface 221 on the side away from the transition arc surface 122 and a second inclined surface 222 on the side closer to the transition arc surface 122. The second insertion portion 223 is formed at the connection between the second reference surface 221 and the second inclined surface 222. The inclination angle between the second reference surface 221 and the fixed surface 123 is greater than the inclination angle between the second inclined surface 222 and the fixed surface 123, so that the second insertion portion 223 is positioned towards the side away from the transition arc surface 122. The length of the second microneedle 22 and the inclination angle relative to the fixed surface 123 can be adjusted according to the type and wall thickness of the blood vessel, so that after anastomosis of blood vessel B6, the second insertion portion 223 can pierce the blood vessel wall of blood vessel B6. Whether it penetrates the blood vessel wall is not specifically limited in this application. Preferably, the tilt angle of the second reference surface 221 of the second microneedle 22 relative to the fixed surface 123 can be set to 30°-60°, that is, the tilt angle of the first microneedle 21 is set to 30°-60°. In some other embodiments, the tilt angle of the second microneedle 22 relative to the fixed surface 123 can also be set to other angles, which are not specifically limited here.

[0042] Please refer to Figure 1-5 and Figure 7The guide microneedles 3 are equidistantly arranged around the guide slope 121, and multiple rows of guide microneedles 3 are arranged along the guide slope 121. The spacing between two adjacent guide microneedles 3 can be adjusted according to different blood vessel types and wall thicknesses, and the spacing between two rows of guide microneedles 3 can be adjusted according to different blood vessel types and wall thicknesses; this application does not make specific limitations here. The guide microneedles 3 are arranged towards the side closer to the transition arc surface 122, that is, the direction of the guide microneedles 3 is the same as the direction of blood vessel A5 introduction and opposite to the direction of blood vessel A5 retraction. When blood vessel A5 is introduced along the guide slope 121 under traction and expansion, the guide microneedles 3 do not apply puncture force to blood vessel A5. However, during the retraction process of blood vessel A5 after anastomosis, the guide microneedles 3 pierce into blood vessel A5 to fix blood vessel A5. Specifically, the side of the guide microneedle 3 away from the transition arc surface 122 forms a third reference surface 31, and the side closer to the transition arc surface 122 forms a third inclined surface 32. The connection between the third reference surface 31 and the third inclined surface 32 forms a third insertion part 33. The inclination angle between the third reference surface 31 and the guide slope 121 is greater than the inclination angle between the third inclined surface 32 and the guide slope 121, so that the third insertion part 33 is positioned away from the transition arc surface 122. The length of the guide microneedle 3 and the inclination angle relative to the guide slope 121 can be adjusted according to the different types and wall thicknesses of blood vessels, so that after the blood vessel A5 is anastomosed, the third insertion part 33 can penetrate the adventitia and media of the blood vessel A5 without puncturing the intima of the blood vessel A5, that is, the guide microneedle 3 will not penetrate the intima of the blood vessel A5. Preferably, the inclination angle between the third reference surface 31 and the guide slope 121 of the guide microneedle 3 can be set to 30°-60°. In other embodiments, the inclination angle between the guide microneedle 3 and the guide slope 121 can also be set to other angles, which are not specifically limited here.

[0043] Please refer to Figure 2-7 Furthermore, to facilitate clear identification of the area covered by the incision in vessel A5 during the procedure, alignment marks 124 are provided on the outer wall of the anastomosis ring 1. The alignment marks 124 are located on the fixed surface 123 away from the transition arc surface 122. Specifically, the alignment marks 124 are positioned between the first microneedle 21 and the second microneedle 22, surrounding the fixed surface 123. When the incision in vessel A5 covers the scale position of the alignment marks 124, the intima of vessel A5 can naturally evert slightly and naturally transition and fit with the intima of vessel B6 after the anastomosis ring 1 is inserted. Preferably, the alignment marks 124 are formed with identifiable scale marks at the corresponding positions on the fixed surface 123 using laser irradiation marking. In other embodiments, the alignment marks 124 can also be formed with identifiable marks at the corresponding positions on the fixed surface 123 using microimprinting, piezoelectric inkjet printing, laser transfer, etc., which are not specifically limited here.

[0044] Please refer to Figure 1 , Figure 6 and Figure 8 To further improve the subsequent fastening effect after anastomosis of blood vessels A5 and B6 and prevent dislocation of blood vessels A5 and B6, a locking ring 4 is added to the outer wall of the anastomosis ring 1. The locking ring 4 is made of an elastic, deformable material and is a hollow tubular structure with an inner diameter larger than the outer diameter of the anastomosis ring 1. After the anastomosis of blood vessels A5 and B6 is completed, the locking ring 4 can lock blood vessels A5 and B6 onto the anastomosis ring 1. In this embodiment, the locking ring 4 has a C-shaped cross-section, and an opening 41 is provided on the side wall of the locking ring 4. The opening 41 is located along the axial direction of the locking ring 4. The opening 41 reduces the strength of the locking ring 4 itself, allowing it to be locked by pressing or locking the ring 4. A fixing ring is provided on one side of the opening 41 on the locking ring 4, with a ratchet on one side and a corresponding pawl on the other. Pressing the locking ring 4 locks the ratchet and pawl, thereby locking the opening 41. In other embodiments, the locking of the opening 41 can also adopt other press-lock fastening structures. The specific construction of the press-lock fastening structure is a well-known technical means, and will not be described in detail here. To ensure that the locking ring 4 and the mating ring 1 are reliably and securely connected, a limiting tongue 42 is provided around the inner wall of the locking ring 4, and a positioning groove 113 is provided around the outer wall 112 of the main body. The shape of the limiting tongue 42 is adapted to the shape of the positioning groove 113. After the locking ring 4 and the mating ring 1 are connected, the opening 41 is locked, and the limiting tongue 42 can be embedded in the positioning groove 113. A push-limiting ring 114 is provided around the side of the positioning groove 113 away from the guide part 12. The push-limiting ring 114 protrudes from the outer wall 112 of the main body, and the protrusion height of the push-limiting ring 114 is greater than the wall thickness of the locking ring 4. When the locking ring 4 and the mating ring 1 are connected, the push-limiting ring 114 can abut against the end of the locking ring 4 to limit the locking ring 4. By fastening the locking ring 4 to the anastomosis ring 1, blood vessels A5 and B6 can be fixed to the anastomosis ring 1, compressing the anastomosis site of blood vessels A5 and B6, preventing the anastomosis ring 1 from loosening or dislodging, and accelerating the healing of blood vessels A5 and B6. In other embodiments, the locking ring 4 and the anastomosis ring 1 can also be fastened after docking by other methods such as snap locking, clamping, or interference fit of elastic claws, which are not specifically limited here.

[0045] The operation method of the anastomosis device in this invention is as follows: S1, the doctor uses micro forceps to grasp one end of the incision of blood vessel A5, pulls it through the inside of the anastomosis ring 1, and finally exposes a certain length of blood vessel A5 to the outside of the anastomosis ring 1.

[0046] During the process of blood vessel A5 passing through the anastomosis ring 1, it first enters the body part 11 through the insertion cavity 13, and then enters the folding cavity 14 formed between the guide slopes 121. Due to the special inclined guiding structure of the guide slopes 121, the folding cavity 14 forms a cone-shaped cavity with a gradually increasing diameter. After blood vessel A5 is pulled in the folding cavity 14, it can naturally extend outward and produce a slight eversion, which slows down the reduction of the diameter of the blood vessel caused by the pull.

[0047] S2. The doctor uses micro forceps and other tools to turn blood vessel A5 outward, causing the inner lining of blood vessel A5 to turn outward. Then, the doctor gently presses on blood vessel A5, causing the first microneedle 21 on the guide bevel 121 and the guide microneedle 3 on the fixing surface 123 to pierce the blood vessel wall, forming a stable eversion structure. Afterward, the doctor can gently pull blood vessel A5 in the opposite direction to ensure that the first microneedle 21 and the guide microneedle 3 are firmly fixed to blood vessel A5.

[0048] Both the first microneedle 21 on the guide slope 121 and the guide microneedle 3 on the fixing surface 123 are oriented in the same direction as the insertion of blood vessel A5 and opposite to the retraction direction of blood vessel A5. This ensures that when blood vessel A5 is inserted under tension, the first microneedle 21 and the guide microneedle 3 do not apply puncture force to blood vessel A5. After insertion, a slight reverse pull on blood vessel A5 allows the first microneedle 21 to pierce the blood vessel wall of blood vessel A5, and the guide microneedle 3 to pierce the blood vessel wall of blood vessel A5 without piercing the intima. This fixes blood vessel A5 while preventing it from retracting or collapsing due to its own elasticity.

[0049] S3. After blood vessel A5 is fixed, the doctor clamps blood vessel B6 and places it over blood vessel A5, maintaining the alignment of the inner lining of blood vessel A5 with the inner lining of blood vessel B6. Then, blood vessel B6 is further pulled so that it passes through the first microneedle 21 and is fixed by the second microneedle 22. The above operation is repeated, pressing blood vessel B6 and then gently pulling in the opposite direction to ensure that the second microneedle 22 is firmly fixed to blood vessel B6, thus completing the anastomosis of blood vessels A5 and B6.

[0050] The second microneedle 22 is oriented in the same direction as the insertion of blood vessel B6 and opposite to the retraction direction of blood vessel B6. This ensures that the second microneedle 22 does not apply puncture force to blood vessel B6 when it is inserted under tension. After the anastomosis is completed, a slight reverse pull on blood vessel B6 allows the second microneedle 22 to penetrate the vessel wall of blood vessel B6, fixing blood vessel B6 while preventing it from retracting or collapsing due to its own elasticity.

[0051] S4. Place the locking ring 4 onto the anastomosis ring 1, ensuring that the locking ring 4 completely covers blood vessels A5 and B6. Then, connect and tighten the locking ring 4 with the anastomosis ring 1 to compress the anastomosis site of blood vessels A5 and B6, thus completing the fixation of the incision sites of blood vessels A5 and B6.

[0052] By using the locking ring 4 and the anastomosis ring 1 to fasten the joint, the anastomosis site of blood vessel A5 and blood vessel B6 can be pressed tightly, preventing the anastomosis ring 1 from loosening or dislodging, while also accelerating the healing of blood vessels A5 and B6.

[0053] The inclined structure of the guide slope 121 forms a cone-shaped cavity with a gradually increasing diameter. Blood vessel A5 is located inside the cavity and can naturally extend outward to produce a slight eversion, thus mitigating the reduction in vessel diameter caused by traction. By setting a first microneedle 21 and a guide microneedle 3 on the guide slope 121 and the fixing surface 123, respectively, with the same orientation as the insertion of blood vessel A5, and setting a second microneedle 22 on the fixing surface 123, respectively, after insertion, blood vessels A5 and B6 are fixed to prevent blood vessels A5 and B6 from shrinking or collapsing due to their own elasticity. This reduces the difficulty of operation while improving the blood supply patency of the anastomosed vessels.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0056] The above description, based on the preferred embodiments of the present invention, provides guidance. Those skilled in the art can make various changes and modifications without departing from the scope of the invention. The technical scope of this invention is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. A microneedle-fixed medical microvascular anastomosis device, characterized in that: For anastomosing blood vessels A (5) and B (6), the anastomosis ring (1) is used. The inner wall of one end of the anastomosis ring (1) is set as a guide bevel (121). A fixing microneedle (2) is provided on the outer wall of the anastomosis ring (1). A guide microneedle (3) is provided on the guide bevel (121). The traction end of the blood vessel A (5) passes through the anastomosis ring (1) and is folded outward and sleeved on the outside of the anastomosis ring (1). The traction end of the blood vessel B (6) is sleeved on the outside of the blood vessel A (5). The fixing microneedle (2) is inserted into the blood vessels A (5) and B (6). The guide microneedle (3) is inserted into the blood vessel A (5).

2. The microneedle fixation medical microvascular anastomosis device according to claim 1, characterized in that: After the blood vessels A (5) and B (6) are anastomosed, the retraction direction is opposite to the traction direction. The fixed microneedle (2) is set in the opposite direction to the retraction direction of the blood vessels A (5) and B (6). The guide microneedle (3) is set in the opposite direction to the retraction direction of the blood vessel A (5).

3. The microneedle fixation medical microvascular anastomosis device according to claim 1, characterized in that: The fixed microneedle (2) is inserted into the vessel wall of vessel A (5) and vessel B (6), and the guide microneedle (3) is inserted into the vessel wall of vessel A (5).

4. The microneedle fixation medical microvascular anastomosis device according to claim 3, characterized in that: A transition arc surface (122) is provided between the guide slope (121) and the outer wall of the matching ring (1), and the guide slope (121) and the transition arc surface (122) are smoothly connected.

5. The microneedle fixation medical microvascular anastomosis device according to claim 1, characterized in that: The fixing microneedle (2) includes a first microneedle (21) for fixing blood vessel A (5) and a second microneedle (22) for fixing blood vessel B (6), wherein blood vessel B (6) is fixed by the second microneedle (22) after passing through the first microneedle (21).

6. The microneedle fixation medical microvascular anastomosis device according to claim 5, characterized in that: Alignment mark (124) is provided on the outer wall of the anastomosis ring (1), and the alignment mark (124) is located between the first microneedle (21) and the second microneedle (22).

7. The microneedle fixation medical microvascular anastomosis device according to claim 1, characterized in that: The anastomosis device also includes a locking ring (4) sleeved on the outside of blood vessel B (6). The locking ring (4) is made of an elastic deformable material and locks blood vessel A (5) and blood vessel B (6) onto the anastomosis ring (1).

8. A microneedle fixation medical microvascular anastomosis device according to claim 7, characterized in that: The locking ring (4) has an opening (41), and pressing the locking ring (4) can close the opening (41).

9. A microneedle fixation medical microvascular anastomosis device according to claim 8, characterized in that: The anastomosis ring (1) is provided with a positioning groove (113) around it. A propulsion limiting ring (114) is provided around the side of the positioning groove (113) away from the guide slope (121). A limiting tongue (42) is provided around the inner wall of the locking ring (4). After the opening (41) is closed, the limiting tongue (42) is embedded in the positioning groove (113).

10. A microneedle fixation medical microvascular anastomosis device according to claim 1, characterized in that: The tilt angle of the fixed microneedle (2) is set to 30°-60°, and the angle of the guide microneedle (3) is set to 30°-60°.

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